resize! (GD2::Image)

    # File lib/gd2/image.rb, line 625
        def resize!(w, h, resample = true)
          ptr = self.class.create_image_ptr(w, h, false)
          SYM[resample ? :gdImageCopyResampled : :gdImageCopyResized].call(
            ptr, image_ptr, 0, 0, 0, 0, w, h, width, height)
          alpha_blending = alpha_blending?
          init_with_image(ptr)
          self.alpha_blending = alpha_blending
          self
        end